Journal ArticleDOI
Electronic Energy Transfer in CdSe Quantum Dot Solids
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TLDR
Electronic energy transfer between close packed quantum dots using cw and time resolved photoluminescence is demonstrated and is consistent with long-range resonance transfer of electronic excitations from the more electronically confined states of the small dots to the higher excitedStates of the large dots.Abstract:
We demonstrate electronic energy transfer between close packed quantum dots using cw and time resolved photoluminescence. Optically clear and thin, close packed quantum dot solids were prepared from mixtures of small and large CdSe quantum dots (38.5 and 62 \AA{}, $\ensuremath{\sigma}l4.5%$). Quenching of the luminescence (lifetime) of the small dots accompanied by enhancement of the luminescence (lifetime) of the large dots is consistent with long-range resonance transfer of electronic excitations from the more electronically confined states of the small dots to the higher excited states of the large dots.read more
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(Invited) Aggregation-Induced Emission in Lamellar Solids of Colloidal Perovskite Quantum Wells
Abstract: The first low-dimensional semiconductor nanocrystal system that increases the photoluminescence quantum yield in aggregates. The outstanding excitonic properties, including photoluminescence quantum yield (ηPL), of individual, quantum-confined semiconductor nanoparticles are often significantly quenched upon aggregation, representing the main obstacle toward scalable photonic devices. We report aggregation-induced emission phenomena in lamellar solids containing layer-controlled colloidal quantum wells (QWs) of hybrid organic-inorganic lead bromide perovskites, resulting in anomalously high solid-state ηPL of up to 94%. Upon forming the QW solids, we observe an inverse correlation between exciton lifetime and ηPL, distinct from that in typical quantum dot solid systems. Our multiscale theoretical analysis reveals that, in a lamellar solid, the collective motion of the surface organic cations is more restricted to orient along the [100] direction, thereby inducing a more direct bandgap that facilitates radiative recombination. Using the QW solids, we demonstrate ultrapure green emission by completely downconverting a blue gallium nitride light-emitting diode at room temperature, with a luminous efficacy higher than 90 lumen W−1 at 5000 cd m−2, which has never been reached in any nanomaterial assemblies by far.
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Spectroscopic investigation of alloyed quantum dot‐based FRET to cresyl violet dye
M. G. Kotresh,K. S. Adarsh,M. A. Shivkumar,B. G. Mulimani,M. I. Savadatti,Sanjeev R. Inamdar +5 more
TL;DR: The transfer efficiency of fluorescence resonance energy transfer from hydrophilic ternary alloyed quantum dots to cresyl violet dye is observed to follow a linear dependence on the spectral overlap and the quantum yield of the donor as predicted by the Förster theory.
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Impact of the band-edge fine structure on the energy transfer between colloidal quantum dots
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Solid-state, ambient-operation thermally activated delayed fluorescence from flexible, non-toxic gold-nanocluster thin films: towards the development of biocompatible light-emitting devices
M J A Talite,H T Lin,Z C Jiang,T N Lin,Hsiu-Ying Huang,E Heredia,A Flores,Yu Chiang Chao,Ji-Lin Shen,C A J Lin,Chi-Tsu Yuan +10 more
TL;DR: A facile, low-cost and effective method was used to generate efficient and stable TADF emissions from solid AuNCs under ambient environment, using polyvinyl alcohol as a solid matrix and it was demonstrated that warm white light can be generated based on a co-doped single emissive layer.
Journal ArticleDOI
Encapsulating CdSe/CdS QDs in the MOF ZIF-8 Enhances Their Photoluminescence Quantum Yields in the Solid State
TL;DR: In this paper , a metal-organic framework (MOF), zeolitic imidazolate framework-8 (ZIF-8), was used to regulate the inter-QD spacing of core-shell QDs in a crystalline host, thus enhancing the photoluminescence quantum yield and irradiance of the films.